/*
    This file is part of the substandard lisp implementation of Standard Lisp
    Copyright (C) 2011 Nicky Nickell

    substandard lisp is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

function std_lessp(a, env) {
  var args = homogenize_args(a);
  var u = args[0].value;
  var v = args[1].value;

  if (args[0].type == TYPE_INTEGER) {
    return (u.compare(v) == -1) ? T : NIL;
  } else {
    return (u < v) ? T : NIL;
  }
}

/*---
name: lessp
arity: 2
rest: false
ftype: FTYPE_EXPR

synonyms:
  - '<'

argument-types:
  - CLASS_NUMBER
  - CLASS_NUMBER

doc: |
  explaining what lessp is / how it is used!

tests: |
  (lessp 0 1) -> T
  (lessp 1 0) -> NIL
  (lessp -1 0) -> T
  (lessp 0 -1) -> NIL
  (lessp 1 1) -> NIL
  (lessp 0.1 1.1) -> T
  (lessp 1.1 0.1) -> NIL
  (lessp -1.1 0.1) -> T
  (lessp 0.1 -1.1) -> NIL
  (lessp 1.1 1.1) -> NIL
  (lessp 0 0.1) -> T
  (lessp 0.1 0) -> NIL
...*/
